CVE-2023-6870

Name: CVE-2023-6870
Creator: NVD / NIST
Published: 2023-12-19T14:15:08.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2023-6870 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Applications which spawn a Toast notification in a background thread may have obscured fullscreen notifications displayed by Firefox. *This issue only affects Android versions of Firefox and Firefox Focus.* This vulnerability affects Firefox < 121.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

Applications which spawn a Toast notification in a background thread may have obscured fullscreen notifications displayed by Firefox. *This issue only affects Android versions of Firefox and Firefox Focus.* This vulnerability affects Firefox < 121.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS Probability

0.38%

29.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 121.0
Mozilla	Firefox Focus	All versions

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1823316Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-56/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1823316Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-56/Vendor Advisory

Timeline

Published: Dec 19, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6870?

How severe is CVE-2023-6870?

CVE-2023-6870 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6870?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6870?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST